Penetration of solar uv radiation and photodissociation in the Jovian atmosphere |
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| Authors: | Guido Visconti |
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| Institution: | Istituto di Fisica, Universita dell''Aquila, 67100 L''Aquila, Italy |
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| Abstract: | We present computations of the photodissociation coefficients for NH3, N2H4, PH3, and H2S in the Jupiter atmosphere. The calculations take into account multiple scattering and absorption using the radiative-transfer method known as δ-Eddington approximation. The atmospheric models include two cloud layers of variable thickness and haze layers above the upper cloud and between the clouds. One of the results of the radiative computations deal with the reflectivity of the Jovian atmosphere as a function of wavelength. A comparison with available data on the albedo of the planet gives some important indications about mixing ratios and distributions of gases and aerosols. The results for the photolysis rates are compared with similar rates obtained by considering either the direct flux or the flux determined by the molecular gas absorption alone. The latter is usually the approximation used in aeronomic models. The results of this comparison show that a considerable difference exists with direct flux photodissociation but significant differences with molecular absorption flux exist only in atmospheric regions where photodissociation is relatively small. |
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